74P/Smirnova-Chernykh
| Parameter |
Value |
| Designation |
74P/Smirnova-Chernykh |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-07-26T18:41:16.967040Z |
| Orbit solution date (soln_date, UTC) |
2026-01-07T20:29:32Z |
| Obs used |
6016 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-01-19.0000000 |
| e |
0.14783764 |
| q (au) |
3.549365 |
| a (au) |
4.165128 |
| i (deg) |
6.651010 |
| Ω (om, deg) |
77.083887 |
| ω (w, deg) |
86.561179 |
| M (ma, deg) |
147.510951 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.720 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.720 |
| n |
6.000 |
| gf |
0.898 |
| gb |
-0.984 |
| k |
1.000 |
| δ90 |
1.002 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
06:39:27.49 |
+29:00:18.0 |
HIP 31737 |
14.15 |
| 2026-02-03 12:00 |
06:39:15.03 |
+29:00:17.8 |
HIP 31737 |
11.44 |
| 2026-02-04 00:00 |
06:39:02.77 |
+29:00:17.1 |
HIP 31737 |
8.78 |
| 2026-02-04 12:00 |
06:38:50.70 |
+29:00:15.8 |
HIP 31737 |
6.17 |
| 2026-02-05 00:00 |
06:38:38.84 |
+29:00:13.9 |
HIP 31737 |
3.65 |
| 2026-02-05 12:00 |
06:38:27.19 |
+29:00:11.5 |
HIP 31737 |
1.45 |
| 2026-02-06 00:00 |
06:38:15.73 |
+29:00:08.6 |
HIP 31737 |
1.92 |
| 2026-02-06 12:00 |
06:38:04.49 |
+29:00:05.2 |
HIP 31737 |
4.18 |
| 2026-02-07 00:00 |
06:37:53.45 |
+29:00:01.3 |
HIP 31737 |
6.54 |
| 2026-02-07 12:00 |
06:37:42.63 |
+28:59:56.9 |
HIP 31737 |
8.88 |
| 2026-02-08 00:00 |
06:37:32.02 |
+28:59:51.9 |
HIP 31737 |
11.18 |
| 2026-02-08 12:00 |
06:37:21.62 |
+28:59:46.5 |
HIP 31737 |
13.45 |
| 2026-02-09 00:00 |
06:37:11.44 |
+28:59:40.5 |
HIP 31544 |
13.39 |
| 2026-02-09 12:00 |
06:37:01.47 |
+28:59:34.1 |
HIP 31544 |
11.27 |
| 2026-02-10 00:00 |
06:36:51.72 |
+28:59:27.2 |
HIP 31544 |
9.22 |
| 2026-02-10 12:00 |
06:36:42.20 |
+28:59:19.8 |
HIP 31544 |
7.28 |
| 2026-02-11 00:00 |
06:36:32.89 |
+28:59:12.0 |
HIP 31544 |
5.49 |
| 2026-02-11 12:00 |
06:36:23.81 |
+28:59:03.6 |
HIP 31544 |
3.99 |
| 2026-02-12 00:00 |
06:36:14.96 |
+28:58:54.9 |
HIP 31544 |
3.12 |
| 2026-02-12 12:00 |
06:36:06.33 |
+28:58:45.6 |
HIP 31544 |
3.32 |
| 2026-02-13 00:00 |
06:35:57.93 |
+28:58:36.0 |
HIP 31544 |
4.39 |
| 2026-02-13 12:00 |
06:35:49.75 |
+28:58:25.8 |
HIP 31544 |
5.82 |
| 2026-02-14 00:00 |
06:35:41.81 |
+28:58:15.3 |
HIP 31544 |
7.37 |
| 2026-02-14 12:00 |
06:35:34.10 |
+28:58:04.3 |
HIP 31544 |
8.95 |
| 2026-02-15 00:00 |
06:35:26.62 |
+28:57:52.9 |
HIP 31544 |
10.52 |
| 2026-02-15 12:00 |
06:35:19.38 |
+28:57:41.0 |
HIP 31544 |
12.07 |
| 2026-02-16 00:00 |
06:35:12.37 |
+28:57:28.8 |
HIP 31544 |
13.58 |
| 2026-02-16 12:00 |
06:35:05.59 |
+28:57:16.1 |
HIP 31544 |
15.05 |
| 2026-02-17 00:00 |
06:34:59.06 |
+28:57:03.1 |
HIP 31544 |
16.48 |
| 2026-02-17 12:00 |
06:34:52.76 |
+28:56:49.6 |
HIP 31544 |
17.87 |
| 2026-02-18 00:00 |
06:34:46.69 |
+28:56:35.7 |
HIP 31544 |
19.20 |
| 2026-02-18 12:00 |
06:34:40.87 |
+28:56:21.5 |
HIP 31544 |
20.49 |
| 2026-02-19 00:00 |
06:34:35.29 |
+28:56:06.8 |
HIP 31544 |
21.73 |
| 2026-02-19 12:00 |
06:34:29.95 |
+28:55:51.8 |
HIP 31544 |
22.93 |
| 2026-02-20 00:00 |
06:34:24.85 |
+28:55:36.5 |
HIP 31544 |
24.07 |
| 2026-02-20 12:00 |
06:34:19.99 |
+28:55:20.7 |
HIP 31202 |
25.02 |
| 2026-02-21 00:00 |
06:34:15.38 |
+28:55:04.6 |
HIP 31202 |
24.36 |
| 2026-02-21 12:00 |
06:34:11.00 |
+28:54:48.1 |
HIP 31202 |
23.77 |
| 2026-02-22 00:00 |
06:34:06.88 |
+28:54:31.3 |
HIP 31202 |
23.26 |
| 2026-02-22 12:00 |
06:34:02.99 |
+28:54:14.1 |
HIP 31202 |
22.82 |
| 2026-02-23 00:00 |
06:33:59.35 |
+28:53:56.6 |
HIP 31202 |
22.44 |
| 2026-02-23 12:00 |
06:33:55.95 |
+28:53:38.8 |
HIP 31202 |
22.14 |
| 2026-02-24 00:00 |
06:33:52.80 |
+28:53:20.6 |
HIP 31202 |
21.89 |